T4 toolbox a very good Visual Studio addin to efficiently manage T4 template. If you move to the new version you should be aware that there is a breaking change in the base Template class. In old version you render all text inside the method RenderCore()
In the new version the function RenderCore is not accessible anymore from derived classes, and you should override the TransformText() function. In my DtoGenerator the above function will be modified in
Since everything is generated into GenerateDto function, I simply changed the declaration of the function and added the return this.GenerationEnvironment.ToString(); to make everything work. If you forget to do this you get the error
Compiling transformation: ‘Microsoft.VisualStudio.TextTemplating.blablabla. RenderCore(): no suitable method found to override. alk.